Packing and method of making same.



R. T. CAMPBELL.

'PACKING AND METHOD 0F MAKING SAME. APPLICATION man MAn.3o.1916.

1.210273. y Patented Dee. 26,1916.

#mwfw i j ROBERT T. CAMPBELL, KANSAS CITY, MISSOURI.

PACKING AND METHOD OF MAKING SAME.

Lamers.

Specification of Letters Patent.

Patented nee. 2e, wie.

Application med March so, 191e. serial Noisavsa To all whom t may; concern:

Be it known that I, ROBERT T. CAMPBELL, a citizenof the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented a certain new and useful Improvement in Packings and Methods of Making Same, of which the following is a specification.

My invention relates to packing and method of making the same.

It relates particularly to packing adapted for piston rods and the lik One of the objects of my invention is to 1 is a vertical sectional view of a series. of convolutions or rings of my 1mproved packing shown mounted on a piston rod and in apacking box. Fig. 2 is a perspective view of a bar of my improved packing. Fig. 3

-y is a perspective view of a bar prior to its l being severed longitudinally to formy two bars of packing.

Similar reference characters designate similarl parts in thedierent views. f

A bar of my improved packing consists of a series of longitudinal laminations, preferably composed of the usual flexible fabric 1 and `rubber 2 arranged alternately and united together in the usual mannen rIhe bar, shown in Fig. 2, has an inner flat side 3, which is adapted to bear against the periphery of a piston rod 4. ,The packing bar y has two parallel sides 5, preferably disposed at right angles to the inner side 3.

' outer side 7 of the packing bar, which is adapted to bear against the inner side of a packing box 6, is of a form` other than Hat, and, as shown in the drawing, is preferably convexly arcuate, the convex side being forced tightly against the inner wall of the The laminations l1v and 2 are preferably disposed parallel with the sides 5, ,their longi-tudinal edges forming the inner side 3.

Embedded in the bar may be provided the The usual rubber core 8, disposed longitudinally and embraced by the laminations l and 2.

By having the inner side 3 of the bar flat, and the sides' 5 parallel with each other and at right angles'to the side 3, an efficient wearing surface for bearing against the rod 4 is obtained, and leakage around the packing is avoided. By having the outer side 7 other than flat, and, preferably, convexly arcuate, as shown, opportunity is afforded for the expansion of the packing within the box 6, when the piston rod 4 becomes heated and thereby expands the packing.

With packing which is circular in cross section, opportunity for expansion is afforded, butan efficient wearing surface is not provided, With the packing rectangular in cross section, an efficient wearing sur- 'face is provided, but room for expansion is lnot afforded, so that, with the last mentioned type of acking, when the piston rod K becomes heate undue wear of the packing occurs due to the incapability ofthe packing to expand in the space provided for it. With my improved construction, a' good wearing surface is provided, a tight pack- Ving afforded, and undue wear avoided by reason of the packing being permitted to expand, when heated, owing to the arcuate form of the outer side. In use, the improved packing may be employed as separate rings, as is usual, or it may be employed in the form of a helix, a manner of use also well known.v lIn the manufacture of the packing, the laminations Vare preferably formed into a bar which is approximately elliptical in cross-section, as shown in Fig. 3, the bar having two parallel sides connected by two arcuate sides. The bar is then longitudinally severed at right angles to the two parallel sides, asdenoted by the dotted line 9 in Fig. 3.

When the finished packing bar contains a rubber core 8, the original bar of which the packing bar forms a half, is provided wlth two cores 8, as shown in Fig. 3, which are respectively disposed parallel with and respectively along opposite edges of a plurality of longitudinal layers which are disposed side by side. Around these longitudinal layers and the'cores 8 is then wound a strip of material comprising flexlble fabric between the adjacent layers of which are layers of rubber. The bar thus formed has a cross section, such as is Shown 111. Fig- 3,

two parallel sides being connected by two arcuate sides. This bar is then longitudinally severed between the cores 8 along the dotted line 9, thereby forming two complete packing bars, approximately semi-elliptical, having a Hat innerside 3, two parallel sides 5 at right angles to the side 3 and an arcuate outer side 7, as shown in Fig. 2.

I do not limit my invention tothe structure shown and described, as modifications, within the scope of the appended claims; may be made without departing from the spirit of my invention.

What I claim is:

1. A packing having two sides at right' angles to its inner side and having an outer side other than flat, the packing comprising laminations the longitudinal edges of which form sai inner side.

2. A packing having two sides at right angles to its inner side and having an arcuate outer side, the packing comprising laminations the. longitudinal edges of which Jform said inner side.

3. A packing having two sides at right angles to its inner side and having a convex outer side, the packing comprising laminations the longitudinal edges of which form said inner side.

4. A packing having a lat inner side and two sides at right anglesto the inner side, and having an outer side other than flat, the packing comprising laminations the longitudinal edges of which form said inner side.

5. A packing having a flatinner side and two sides at right angles to the inner side, and yhaving an arcuate outer side, the packing comprising laminations the edges of which form said inner side.

6. A packing having a flat inner side and two sides at right angles to the inner side, and having a convex outer side, the packing comprising laminations the edges of which form said inner side.

7. The method of making packing consisting in forming a bar of alternate longitudinal laminations of fabric and rubber, the bar in cross section 'having two sides disposed parallel with each other and connected by arcuate sides, and then longitudinally severing the bar through the parallel sides at right angles thereto. l

8. The method of making packing consisting in forming a bar comprising laminations of flexible material, the bar in crosssection forming a ligure having parallel sides and arcuate ends, and then longitudinally severing the bar through the parallel sides at right angles thereto.

9. The method of making packing consisting in forming a bar by winding upon each other layers of flexible material so as to form in cross section a ligure having parallel sides and arcuate ends, and then longi-V tudlnally severing the bar through said par-y -allel sides at right angles thereto.

10. The method of making packing consisting in forming a bar by arranging a series of longitudinal layers of flexible material side by side, then disposing two parallel rubber cores respectively against the two sets of longitudinal edges of said layers, then winding around said cores and said layers, a series of layers of flexible material, and then longitudinally severing said bar between said cores and parallel therewith.

In testimony whereof I have signed my name to this specification.

ROBERT T. CAMPBELL. 

